Ingrown hairs are just here to irritate us, as any woman or man who has experienced them can tell you. But what are they? They are hairs that, instead of growing outward, grow under the skin, which can cause many discomforts, like swelling and pain. Most commonly they appear in the beard area, in the armpits, or on the legs. Why do we have to deal with this? Because after removing hair, when it grows back, sometimes it doesn’t do it in the right way.